Prashant Guleria ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-16903 ( https://hibernate.atlassian.net/browse/HHH-16903?atlOrigin=eyJpIjoiYWE4ZG... ) Re: java.lang.IllegalStateException: Illegal pop() with non-matching JdbcValuesSourceProcessingState ( https://hibernate.atlassian.net/browse/HHH-16903?atlOrigin=eyJpIjoiYWE4ZG... ) In class org.hibernate.collection.spi. AbstractPersistentCollection<E> implements Serializable PersistentCollection<E> the method prepareForPossibleLoadingOutsideTransaction is called from unsetSession like following from class {{ org.hibernate.engine.internal}}. StatefulPersistenceContext : final SharedSessionContractImplementor session = getSession(); if ( collectionEntries != null ) { IdentityMap.onEachKey( collectionEntries, k -> k.unsetSession( session ) ); } ( https://hibernate.atlassian.net/rest/api/3/attachment/content/50493 ) If you see in the screenshot, the {{currentSession}}holds a session object but this.session is null, which causes {{allowLoadOutsideTransaction}}to be set as false and throws exception later in {{prepareForPossibleLoadingOutsideTransaction}}becuase both sessiion and tempsession are null. I think currentsession variable should be passed to prepareForPossibleLoadingOutsideTransaction }}to check if a transaction is allowed outside transaction or not. {{allowLoadOutsideTransaction = session.getFactory().getSessionFactoryOptions().isInitializeLazyStateOutsideTransactionsEnabled(); ( https://hibernate.atlassian.net/browse/HHH-16903#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16903#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100230- sha1:acc9c6f )